Detailed Explanation:

Rationale for Correct Answer:The error indicates that the saved plan is stale, meaning the Terraform state has changed since the plan was created. Terraform ensures consistency between the plan and the current state, so it will not allow applying an outdated plan file.

D is correct because generating a new plan (terraform plan) ensures it reflects the current state, after which it can be safely applied.

E is also correct because running terraform apply without a saved plan automatically creates a fresh plan and applies it in one step, ensuring consistency with the latest state.

Analysis of Incorrect Options (Distractors):

A. terraform state push — Incorrect because this command is used to manually push state data, not to update or fix a stale execution plan.

B. -refresh-only flag — Incorrect because this updates the state to match real infrastructure but does not resolve the stale saved plan issue or make it applicable.

C. -lock=false — Incorrect because state locking prevents concurrent operations; disabling it does not fix the mismatch between the saved plan and the current state.

Key Concept:Terraform saved plans are state-dependent and become invalid if the state changes. You must regenerate the plan or apply without using a saved plan.